I was watching him warm up on the putting green in St Andrews on Friday. He hit 5 reps of 3 balls from a good 12 feet. ALL of them went straight into the hole and all with virtually the same speed. Looked VERY good and jaws were dropping along the fence. By far the most impressing putter on the green. Others were missing here and there but Vijay was dead on. I was standing face-on & could not tell if his stroke was on-plane or not.
i took a few putting lessons from mike shannon several years ago. he was at isleworth for a while.
we worked far less on mechanics and far more on set up, putter fit, and eye type and and putter loft and how it affects your aim. and a real strange way to envision putts.
i know this is an old thread but i thought i would add my $.02.